part A

part B

part C

part D

Slide 1 is a sample of a single-celled organism that cannot directly exchange substances with the environment.

Slide 2 is a sample from a multi-celled organism that can directly exchange substances with the environment.

Slide 1 is a sample of a single-celled organism with a single cell that can exist independently.

Slide 2 is a sample from a multi-celled organism with a single cell that can exist independently.

bacterial cell

red blood cell

skin cell

white blood cell

amoeba

ant

cat

clam

1,2, and 3

1, 3, and 5

3, 4, and 5

1, 2, and 5

only cell X

only cell Y

both cell X and Y

neither cell X nor cell Y

Unicellular organisms have transport systems between cells.

Unicellular organisms consist of many cells that must work together to perform life processes.

Unicellular organisms consist of a single cell that performs all life processes.

Unicellular organisms live only inside other organisms.